Valve Guide Seal: Service and Repair

Valve stem seals, removing and installing
Special tools and equipment





^ Spark plug wrench 3122 B





^ Installation tool VAS 5161





^ Removal tool 3364





^ Installation tool 3365

Removing
Cylinder head installed
^ Remove camshafts Page 15-50.
^ Remove spark plugs with spark plug wrench 3122B.





^ Turn valve roller lever up and secure with rubber band.





^ Install mounting plate VAS 5161/7 from VAS 1561 to cylinder head.
^ Secure plate with serrated screws VAS 516/12.
^ Using drift VAS 5161/3, loosen valve keepers by tapping with plastic hammer.





^ Install serrated support VAS 5161/6 with VAS 5161/5 into plate 5161/7.
^ Install cartridge VAS 5161/8 into plate VAS 5161/7.
^ Install pressure hose adapter T40012/1 with sealing ring into applicable spark plug hole and hand tighten.
^ Attach air hose and apply steady pressure.
Minimum air pressure 6 bar (87 psi)
^ Insert lever VAS 5161/2 into lever support VAS 5161/6 and lightly press down on cartridge VAS 5161 / VAS 5161/8. Turn cartridge at serrated part until points engage in slots between valve keepers.

By slightly turning serrated part of cartridge, the valve keepers are separated and captured by the cartridge.
^ Release pressure on lever.
^ Remove valve spring and plate.





^ Remove valve stem seal with 3364.

Installing





^ To prevent damage to new seal, place plastic sleeve -A- on valve stem.
^ Lightly lubricate sealing lip and valve stem with oil.
^ Install valve stem seal -B- without oiling outside of seal, into seal driver 3129 and carefully push seal down over valve stem down to valve guide.